TexasCHLforum.com

This is almost back to the price from several years back when Wally World's price was $6.99/bx100. The break down is $7.20 per 100 rounds. I don't know what the shipping costs are for smaller orders, but they advertise free shipping for bulk sales and 10 boxes of 500 (5000 rounds) for $359.90 qualifies for free shipping. Other ammunition is on sale as well. I am am in no way affiliated with this vendor, but have ordered from them and have had no problems.
Target Sports USA
This is the link. Options are 500 or 5000
https://www.targetsportsusa.com/cci-min ... 10580.aspx

I was enthused to find this at 5 cents per round but out of stock of course. Free shipping on a case of ten, if that holds once they restock.

https://www.targetsportsusa.com/cci-pat ... 83040.aspx

ETA Here's an option at 3.6 cents per round for a 1600 round carton and free shipping on one carton. Out of stock of course.

https://www.targetsportsusa.com/federal ... 08502.aspx